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Grace's spectroscope Browning, John Late 19th c. View |
Hartridge Reversion Spectroscope W.H. Grayling 1920s? View |
Hartridge Spectroscope R. & J. Beck Ltd c.1937? View |
Jeweller's Spectacle-Mounted Direct Vision Spectroscope Browning, John 1900-1910 View |
Rain-band spectroscope & case Browning, John Late 19th c. View |
Thorp's Spectroscope & case R. & J. Beck Ltd Late 19th c. / Early 20th c. View |